I have written the tips I have - either you choose to be honest and indicate to your bank that they are casino transactions and possibly add that you did not receive the deposits.
Option two is to lie and say you bought something you didn't receive.
For both options, it can be good to prepare by sending an email to the casino/dealer where you claim that you shopped and work hard on your story. Then you have some "proof" to show the bank.
But again, remember it's a scam and you can go there on it even if the risk isn't that high, or get your bank accounts closed and banking blocked (higher risk).
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